1 /*
2 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /**
25 * @test TestSoftReferencesBehaviorOnOOME
26 * @key gc
27 * @summary Tests that all SoftReferences has been cleared at time of OOM.
28 * @library /testlibrary
29 * @build TestSoftReferencesBehaviorOnOOME
30 * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 512 2k
31 * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 128k 256k
32 * @run main/othervm -Xmx128m TestSoftReferencesBehaviorOnOOME 2k 32k
33 */
34 import com.oracle.java.testlibrary.Utils;
35 import com.oracle.java.testlibrary.Asserts;
36 import java.lang.ref.SoftReference;
37 import java.util.LinkedList;
38 import java.util.Random;
39
40 public class TestSoftReferencesBehaviorOnOOME {
41
42 /**
43 * Test generates a lot of soft references to objects with random payloads.
44 * Then it provokes OOME and checks that all SoftReferences has been gone
45 * @param args - [minSize] [maxSize] [freq]
46 * where
47 * - minSize - min size of random objects
48 * - maxSize - max size of random objects
49 */
50 public static void main(String[] args) {
51 long minSize = DEFAULT_MIN_SIZE;
52 long maxSize = DEFAULT_MAX_SIZE;
53
54 if ( args.length >= 2) {
55 maxSize = getBytesCount(args[1]);
56 }
57
58 if ( args.length >= 1) {
59 minSize = getBytesCount(args[0]);
60 }
61
62 new TestSoftReferencesBehaviorOnOOME().softReferencesOom(minSize, maxSize);
63 }
64
65 /**
66 * Test that all SoftReferences has been cleared at time of OOM.
67 */
68 void softReferencesOom(long minSize, long maxSize) {
69 System.out.format( "minSize = %d, maxSize = %d%n", minSize, maxSize );
70
71 LinkedList<SoftReference> arrSoftRefs = new LinkedList();
72 staticRef = arrSoftRefs;
73 LinkedList arrObjects = new LinkedList();
74 staticRef = arrObjects;
75
76 long multiplier = maxSize - minSize;
77 long numberOfNotNulledObjects = 0;
78
79 try {
80
81 // Lets allocate as many as we can - taking size of all SoftRerefences
82 // by minimum. So it can provoke some GC but we surely will allocate enough.
83 long numSofts = (long) ((0.95 * Runtime.getRuntime().totalMemory()) / minSize);
84 System.out.println("num Soft: " + numSofts);
85
86 while (numSofts-- > 0) {
87 int allocationSize = ((int) (RND_GENERATOR.nextDouble() * multiplier))
88 + (int)minSize;
89 arrSoftRefs.add(new SoftReference(new byte[allocationSize]));
90 }
91
92 System.out.println("free: " + Runtime.getRuntime().freeMemory());
93
94 // provoke OOME.
95 while (true) {
96 arrObjects.add(new byte[(int) Runtime.getRuntime().totalMemory()]);
97 }
98
99 } catch (OutOfMemoryError oome) {
100
101 // Clear allocated ballast, so we don't get another OOM.
102 staticRef = null;
103 arrObjects = null;
104 long oomSoftArraySize = arrSoftRefs.size();
105
106 for (SoftReference sr : arrSoftRefs) {
107 Object o = sr.get();
108
109 if (o != null) {
110 numberOfNotNulledObjects++;
111 }
112 }
113
114 // Make sure we clear all refs before we return failure
115 arrSoftRefs = null;
116 Asserts.assertFalse(numberOfNotNulledObjects > 0,
117 "" + numberOfNotNulledObjects + " out of "
118 + oomSoftArraySize + " SoftReferences was not "
119 + "null at time of OutOfMemoryError"
120 );
121 } finally {
122 Asserts.assertTrue(arrObjects == null, "OOME hasn't been provoked");
123 Asserts.assertTrue(arrSoftRefs == null, "OOME hasn't been provoked");
124 }
125 }
126
127 private static final long getBytesCount(String arg) {
128 String postfixes = "kMGT";
129 long mod = 1;
130
131 if (arg.trim().length() >= 2) {
132 mod = postfixes.indexOf(arg.trim().charAt(arg.length() - 1));
133
134 if (mod != -1) {
135 mod = (long) Math.pow(1024, mod+1);
136 arg = arg.substring(0, arg.length() - 1);
137 } else {
138 mod = 1; // 10^0
139 }
140 }
141
142 return Long.parseLong(arg) * mod;
143 }
144
145 private static final Random RND_GENERATOR = Utils.getRandomInstance();
146 private static final long DEFAULT_MIN_SIZE = 512;
147 private static final long DEFAULT_MAX_SIZE = 1024;
148 private static Object staticRef; // to prevent compile optimisations
149 }